www.wallbike.com
used to sell them. i bought a set but they don't work on my crosscheck.
unfortunately i mangled them trying to get them to work...
quoted from sheldon brown: "A frame/fork mounted device designed to brush sharp debris from the tread of tires before it can penetrate through to the inner tube. Tire savers usually attach to the brake center bolt, and are commonly made from recycled spokes."
maybe make your own? it is winter and you may be quite cold and bored???
